declare module "index" {
    /**
     * Submits application events.
     *
     * @template TTypes   Event names linked to their arg types.
     */
    export interface IEventSubmitter<TTypes = any> {
        /**
         * Emits an event, along with any amount of additional information.
         *
         * @param eventName   Name of an event.
         * @param args   Any additional information for the event.
         */
        emit<TEventName extends keyof TTypes>(eventName: TEventName, ...args: TTypes[TEventName][]): void;
    }
    /**
     * Receives application events.
     *
     * @template TTypes   Event names linked to their arg types.
     */
    export interface IEventReceiver<TTypes = any> {
        /**
         * Binds an event listener to an event name.
         *
         * @param eventName   Name of an event.
         * @param listener   Listener for the event.
         */
        on<TEventName extends keyof TTypes>(eventName: TEventName, listener: (...args: TTypes[TEventName][]) => void): void;
        /**
         * Binds an event listener to the first time an event name.
         *
         * @param eventName   Name of an event.
         * @param listener   Listener for the event.
         * @remarks If the event name was already fired, it's immediately called with the args from the first event.
         */
        onFirst<TEventName extends keyof TTypes>(eventName: TEventName, listener: (...args: TTypes[TEventName][]) => void): void;
        /**
         * Binds an event listener to all events.
         *
         * @param listener   Called on any event with the event name and args.
         */
        onAny(listener: <TEventName extends keyof TTypes>(eventName: TEventName, ...args: TTypes[TEventName][]) => void): void;
        /**
         * Removes an event listener from an event name.
         * If no listener is provided, it removes all listeners for that event name.
         * If no event name is provided, it removes all listeners for all event names.
         *
         * @param eventName   Name of an event, if not all events.
         * @param listener   Listener for the event, if not all listeners for the event(s).
         * @remarks Throws an error if the listener wasn't added for that event name.
         */
        off<TEventName extends keyof TTypes>(eventName?: TEventName, listener?: (...args: TTypes[TEventName][]) => void): void;
        /**
         * Creates a Promise to be resolved the next time an event is fired.
         *
         * @param eventName   Name of an event.
         * @returns A Promise to be resolved with the first object passed with the event.
         */
        waitFor<TEventName extends keyof TTypes>(eventName: TEventName): Promise<TTypes[TEventName]>;
        /**
         * Creates a Promise to be resolved the first time an event is fired.
         *
         * @param eventName   Name of an event.
         * @returns A Promise to be resolve with the first object passed with the first event.
         * @remarks If the event name was already fired, it's immediately resolved with the args from the first event.
         */
        waitForFirst<TEventName extends keyof TTypes>(eventName: TEventName): Promise<TTypes[TEventName]>;
    }
    /**
     * Hub for triggerable application events.
     *
     * @template TTypes   Event names linked to their arg types.
     */
    export class EventEmitter<TTypes = any> implements IEventSubmitter<TTypes> {
        /**
         * Listeners to fire on all events.
         */
        private readonly anyRegistrations;
        /**
         * Listeners and first args registered to events.
         */
        private registrations;
        /**
         * Binds an event listener to an event name.
         *
         * @param eventName   Name of an event.
         * @param listener   Listener for the event.
         */
        on<TEventName extends keyof TTypes>(eventName: TEventName, listener: (...args: TTypes[TEventName][]) => void): void;
        /**
         * Binds an event listener to the first time an event name.
         *
         * @param eventName   Name of an event.
         * @param listener   Listener for the event.
         * @remarks If the event name was already fired, it's immediately called with the args from the first event.
         */
        onFirst<TEventName extends keyof TTypes>(eventName: TEventName, listener: (...args: TTypes[TEventName][]) => void): void;
        /**
         * Binds an event listener to all events.
         *
         * @param listener   Called on any event with the event name and args.
         */
        onAny(listener: <TEventName extends keyof TTypes>(eventName: TEventName, ...args: TTypes[TEventName][]) => void): void;
        /**
         * Removes an event listener from an event name.
         * If no listener is provided, it removes all listeners for that event name.
         * If no event name is provided, it removes all listeners for all event names.
         *
         * @param eventName   Name of an event, if not all events.
         * @param listener   Listener for the event, if not all listeners for the event(s).
         * @remarks Throws an error if the listener wasn't added for that event name.
         */
        off<TEventName extends keyof TTypes>(eventName?: TEventName, listener?: (...args: TTypes[TEventName][]) => void): void;
        /**
         * Emits an event, along with any amount of additional information.
         *
         * @param eventName   Name of an event.
         * @param args   Any additional information for the event.
         */
        emit<TEventName extends keyof TTypes>(eventName: TEventName, ...args: TTypes[TEventName][]): void;
        /**
         * Creates a Promise to be resolved the next time an event is fired.
         *
         * @param eventName   Name of an event.
         * @returns A Promise to be resolved with the first object passed with the event.
         */
        waitFor<TEventName extends keyof TTypes>(eventName: TEventName): Promise<TTypes[TEventName]>;
        /**
         * Creates a Promise to be resolved the first time an event is fired.
         *
         * @param eventName   Name of an event.
         * @returns A Promise to be resolve with the first object passed with the first event.
         * @remarks If the event name was already fired, it's immediately resolved with the args from the first event.
         */
        waitForFirst<TEventName extends keyof TTypes>(eventName: TEventName): Promise<TTypes[TEventName]>;
        /**
         * Ensures the registrations object for an event exists.
         *
         * @param eventName   Name of an event.
         * @returns Registrations for the event.
         */
        private safelyGetRegistration<TEventName>(eventName);
    }
    export const Squee: typeof EventEmitter;
}